Mellanox SN2010 no connectivity between two hosts on same subnet through L3 gateway on mellanox interface with VLAN.

Checked configuration on hosts, all is working. But no responses from Mellanox gateway interface for ARP or who-has _gateway from source host IP.

Hosts are SAN system and ubuntu server connecting via Ethernet 1/18 on mellanox switch. Have L2 and L3 configurations set on mellanox but hosts cannot ping gateway or get arp response for their requests from the mellanox.

Please refer this documentation as reference of your case:

https://community.mellanox.com/s/article/howto-configure-inter-vlan-routing-on-mellanox-switches

To enable L3 function, you need to enable “ip routing” globally.